Front

What happens when the rate of heat production in the body is greater than the rate of heat loss?

Back

The body temperature rises.

Front

How is body temperature controlled?

Back

By balancing heat production against heat loss.

Front

What is a factor in heat production related to muscle activity?

Back

Extra rate of metabolism caused by muscle activity, including muscle contractions caused by shivering

Front

What hormone is mentioned as causing extra metabolism in the cells?

Back

Thyroxine

Front

Which of the following is NOT a cause of extra metabolism mentioned in the text?

• Effect of epinephrine and norepinephrine
• Increased chemical activity in the cells
• Basal rate of metabolism
• Muscle contractions caused by shivering

Back

Basal rate of metabolism

Front

What is the role of epinephrine in heat production?

Back

It causes extra metabolism through sympathetic stimulation

Front

Where is most of the heat produced in the human body?

Back

In the liver, brain, and heart

Front

What determines the rate at which heat is lost from the body?

Back

How rapidly heat is conducted to the skin and transferred to the surroundings

Front

At normal room temperature, what percentage of total heat loss is by radiation?

Back

60 percent

Front

What does loss of heat by radiation mean?

Back

Loss in the form of infrared heat rays